Hi, all,
According to the Supreme Court ruling dated 23rd septmber 2015, BBVA, SGR and Banco Popular should respond all together regardless the account the money was paid into.
There are also some previous rulings of the Supreme Court in that sense (ruling dated 13th january 2015, for instance)
So, you should claim you money against any of these entities.
You could also claim Banco Sabadell (that acquired CAM) as liable for not checking the amounts repayment was guaranteed by BG or insurance, but once you have the direct way traced by the ruling dated 23rd sept, it would be a longest travel.
Kind regards